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The purpose of this study is to examine the longitudinal impact of depressive symptoms on physical activity (PA) levels, sedentary behavior, and screen time among first-generation, Mexican-heritage youth. Mexican-heritage families were recruited by promotoras de salud from colonias in Hidalgo County, Texas. Participants (n = 200 youth, 116 families in final sample) completed at-home, interviewer-administered surveys once during the summer (June-July) and once during the fall (August-December). Youth PA and sedentary behaviors were assessed using a validated 7-day recall instrument. The validated Center for Epidemiology Studies-Depression Child scale was used to assess depression symptoms. Linear mixed-effects models were used to analyze the relationships of PA and sedentary behavior with depressive symptoms. Results showed that those depression symptoms were significantly associated with decreased number of self-reported minutes of sitting and screen time over time in the full sample and among male youth. Depression symptoms also significantly decreased the number of self-reported active and moderate to vigorous PA minutes over time among male youth. Researchers can build on our findings by identifying the mechanisms driving the relationships between depression and PA/sedentary behavior. Public health-programing efforts should intentionally consider the impact that depressive symptoms have on PA.
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Depressão , Comportamento Sedentário , Adolescente , Criança , Humanos , Masculino , Depressão/epidemiologia , Exercício Físico , Atividade Motora , Inquéritos e Questionários , FemininoRESUMO
BACKGROUND: Pediatric growth tracking has been identified as a top priority by international health agencies to assess the severity of malnutrition and stunting. However, remote low-resource settings often lack the necessary infrastructure for longitudinal analysis of growth for the purposes of early identification and immediate intervention of stunting. METHODS: To address this gap, we developed a portable field unit (PFU) capable of identifying a child over the course of multiple visits, each time adding new anthropomorphic measurements. We conducted a preliminary field evaluation of the PFU by using the unit on two distinct visits to three schools in the area surrounding a medical clinic in rural San Jose, Honduras. The unit was used to assess children at each school as part of the community outreach. RESULTS: Community outreaches to three schools were conducted by two distinct teams, where they used the device to assess 210 children. Of the 180 children registered during the first visit, 112 were re-identified and assessed on the subsequent visit. Twenty-four instances of moderate-to-severe malnutrition were identified and referred for further evaluation to the central clinic. CONCLUSION: This initial assessment suggests that the PFU could be an effective means of identifying at-risk children.
CONTEXTE: Les organismes internationaux de santé ont identifié le suivi de la croissance des enfants comme une priorité absolue pour évaluer la gravité de la malnutrition et les retards de croissance. Cependant, les zones reculées à faibles ressources n'ont souvent pas les infrastructures nécessaires à l'analyse longitudinale de la croissance à des fins d'identification précoce et d'intervention immédiate de lutte contre les retards de croissance. MÉTHODES: Pour combler ces lacunes, nous avons développé un appareil portatif de terrain (PFU) capable d'identifier un même enfant lors de plusieurs visites et d'ajouter les nouvelles mesures anthropomorphiques de chaque visite. Nous avons réalisé une évaluation de terrain préliminaire du PFU en utilisant l'appareil lors de deux visites différentes dans trois écoles de la zone rurale aux alentours d'une clinique médicale de San Jose, Honduras. L'appareil a été utilisé pour évaluer les enfants de chaque école dans le cadre d'un programme de sensibilisation communautaire. RÉSULTATS: Des programmes de sensibilisation communautaire ont été menés dans trois écoles par deux équipes différentes, qui ont utilisé l'appareil pour évaluer 210 enfants. Sur les 180 enfants enregistrés lors de la première visite, 112 ont été de nouveau identifiés et évalués lors de la visite suivante. Vingt-quatre cas de malnutrition modérée à sévère ont été identifiés et adressés pour examen complémentaire à la clinique centrale. CONCLUSION: Cette évaluation initiale suggère que le PFU pourrait être un moyen efficace d'identification des enfants à risque.
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Physical activity (PA) is a public health priority due to holistic health benefits; however, many adults do not meet PA guidelines. Few studies have examined Mexican-heritage fathers' social networks, specifically with whom they are physically active. This study examines changes in Mexican-heritage fathers' PA networks after participation in a father-focused, family-centered health program. Families consisting of child (aged 9-11 years), mother, and father were recruited from colonias on the Texas-Mexico border for participation in a 6-week father-focused, family-centered program concentrated on healthy eating and active living. Fathers reported up to 5 people with whom they were active most in the previous month before and after the program as well as how often they were active with the person and what activities they did most often. Multilevel regression models examined changes in networks. Fathers (n = 42; mean age = 39.07 years, SD = 7.45) were significantly more likely to report more frequent PA with others after the program as compared with before. General active play and conditional support were mentioned most frequently. This study provides context to the social networks and PA behaviors of Mexican-heritage fathers and suggests that a father-focused, family-centered health program can increase the PA frequency with social network connections.
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Exercício Físico , Pai , Adulto , Criança , Feminino , Promoção da Saúde , Humanos , Masculino , México , Atividade MotoraRESUMO
Fathers significantly influence family functioning, as coparents and partners, and must be part of family-based approaches to behavioral health interventions or programs. But little is known regarding how to support Latino fathers in health promotion within their family systems, specifically for Latino families living in border communities. Program development was embedded in a larger community-based grant and part of a longstanding academic-community collaboration. An interdisciplinary research team applied theories related to health behavior, family systems, behavior change, and community engagement to develop a father-focused and family-centered behavioral program for Mexican-heritage fathers and children living near the Texas-Mexico border to support changes in nutrition and physical activity at the individual and family levels. Promotoras de salud (trained community health workers) delivered the program through group sessions, check-in calls, and at-home activities. Group session activities were designed to engage family triads and dyads using experiential education related to nutrition and physical activity, like cooking lessons and active play, over a six-week period. Future research can use the program approach and curricula as a roadmap for designing context-specific and culturally-relevant programs for Latino families. Additional research is needed to explore how approaches like this can support families and their health goals.
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Exercício Físico , Pai , Criança , Promoção da Saúde , Humanos , Masculino , México , TexasRESUMO
Mexican-heritage children often achieve less physical activity (PA) than their counterparts and are at greater risk for associated comorbidities. Child PA is greatly influenced by their parents, yet researchers have rarely involved fathers in community health promotion. The purpose of this study is to examine Mexican-heritage fathers' perceptions of responsibilities and self-reported activities. Promotoras recruited fathers (n = 300) from colonies on the Texas-Mexico border and administered Spanish-language surveys including paternal responsibilities, father PA, and PA co-participation. Two researchers coded responses. Open-ended items were coded and cross-tabulations between responsibilities and activities with children were examined. Fathers reported feeling monetary responsibilities most often. Fathers reported engaging in more activities with their sons than daughters; however, fathers engaged in very few activities specifically with their children. Feeling responsible for family expenses was associated with paternal PA co-participation with family and children. This study adds clarity to the role of Mexican-heritage fathers in child PA. Findings highlight potential areas for intervention including supporting fathers to take an active role in their children's PA.
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Exercício Físico , Pai , Criança , Humanos , Masculino , México , Inquéritos e Questionários , TexasRESUMO
Despite benefits of physical activity (PA), most Americans are not regularly active, with notable disparities for residents of low-income communities. PA is positively correlated with resource availability and quality, which can be measured and quantified by PA resource assessment tools. However, community members' perceptions are often not considered. This study incorporates community perceptions with systematic environmental observations to identify community PA resource priorities. The PA Space Methodology for Assessment and Prioritization (PASMAP) includes three phases. Phase 1: Promotora-researchers completed 57 PA Resource Assessments (PARAs) in colonias along the Texas-Mexico border assessing quantity and quality of features, amenities, and incivilities. Characteristics were ranked using average PARA scores from all PA spaces. Phase 2: community advisory board (CAB) members (n = 36 from 3 CABs) ranked the importance of each feature, amenity, and incivility respectively; rankings were averaged and ordered. Phase 3: differences between phases 1 and 2 were calculated. Large differences indicated high discordance between systematic observations and perceived importance. Phase 1: highest ranked PARA characteristics were sidewalks, non-street lighting, and noise. Phase 2: CAB members ranked trails/paths, sidewalks, play equipment, bathrooms, drinking fountains, substance abuse evidence, and litter most important. Phase 3: multiple characteristics had high discordance: trails/paths, fenced-in open fields (features), drinking fountains (amenity), and litter (incivility); low quantity/poor quality yet perceived as highly important. Discordant characteristics identified through PASMAP provide evidence-based, community-valued recommendations on PA resource priorities for planning and advocacy. Future work should incorporate perceptions from additional community members and apply PASMAP methods to other environmental assessments.
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Exercício Físico , Pobreza , Humanos , México , Percepção , Texas , Estados UnidosRESUMO
BACKGROUND: Shared genetic and environmental factors suggest that family relationships are important predictors of obesity-related behaviors, yet little is known about how siblings influence physical activity and sedentary behaviors. This study examined physical activity and sedentary behavior between sibling dyads across summer and fall time points and determined if birth order and gender modify the relationship between sibling behaviors. METHODS: Mexican-heritage families residing in colonias along the United States-Mexico border were recruited using promotoras de salud to participate in summer and school year surveys. Eighty-seven sibling dyads had complete data for the physical activity sub-study: 21 older brother-younger brother, 21 older brother-younger sister, 23 older sister-younger brother, and 22 older sister-younger sister dyads. Physical activity and sedentary behavior were measured using a validated 7-day recall instrument to create summary measures of weekly active, moderate-to-vigorous physical activity (MVPA) metabolic equivalents (MET), sitting, and screen time minutes. We used linear regression analyses to examine changes over time and the association between older and younger sibling behavior. RESULTS: During summer, older siblings (mean age = 11.2 years) reported 1069 active minutes and 1244 sitting minutes per week; younger siblings (mean age = 8.3 years) reported 1201 active minutes and 1368 sitting minutes per week. Younger brothers reported fewer active minutes (mean = - 459.6; p = 0.01) and fewer MVPA MET-minutes (mean = - 2261.7; p = 0.02) of physical activity during the fall. Within all 87 dyads, older sibling physical activity was significantly associated with younger sibling active minutes (B = 0.45;p = 0.004) and MET-minutes (B = 0.45;p = 0.003) during summer but not fall; older sibling sedentary behavior was significantly associated with younger sibling sitting (B = 0.23;p = 0.01) and screen time minutes (B = 0.23;p = 0.004) during fall but not summer. After stratifying by gender dyad groups, younger brother behavior was strongly associated with older brother behavior at both time points. CONCLUSION: Younger siblings appear to emulate the physical activity behaviors of their older siblings during non-school summer months and sedentary behaviors of older siblings during school-time fall months, especially older brother-younger brother dyads. Family-based interventions to increase physical activity and decrease sedentary behavior are growing in popularity, but more work is needed to understand the role of sibling influences.
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Exercício Físico , Comportamento Sedentário/etnologia , Irmãos , Adolescente , Fatores Etários , Ordem de Nascimento , Criança , Emigrantes e Imigrantes/estatística & dados numéricos , Feminino , Comportamentos Relacionados com a Saúde , Humanos , Estudos Longitudinais , Masculino , Americanos Mexicanos , Estações do Ano , Fatores Sexuais , Texas/epidemiologiaRESUMO
Progesterone shows anti-inflammatory and promyelinating effects in mice with experimental autoimmune encephalomyelitis (EAE), a commonly used model for multiple sclerosis (MS). Because neurosteroids have been implicated as protective factors for MS and EAE, we analysed the expression of neurosteroidogenic enzymes in the compromised spinal cord of EAE mice. EAE was induced in female C57Bl6 mice, which were then killed on day 16 after induction. Progesterone was given by pellet implantation 1 week before EAE induction. Untreated EAE mice showed decreased mRNAs for the steroidogenic acute regulatory protein (Star), voltage-dependent anion channel (VDAC), cholesterol side-chain cleavage (P450scc), 5α-reductase, 3α-hydroxysteroid dehydrogenase (3α-HSOR) and aromatase, whereas changes of 3ß-hydroxysteroid dehydrogenase (3ß-HSD) were not significant. mRNA translocator protein (18 kDa) (TSPO) was elevated, concomitantly with a reactive microgliosis. EAE mice also showed abnormal mitochondrial ultrastructure in axons and neuronal bodies, as well as reduced expression of fission and fusion protein mRNAs. Progesterone pretreatment before EAE induction increased Star, VDAC, P450scc, 5α-reductase type I, 3α-HSOR and aromatase mRNAs and did not modify 3ß-HSD. TSPO mRNA was decreased, possibly as a result of reversal of microgliosis. Progesterone pretreatment also improved mitochondrial ultrastructure and increased fission/fusion protein mRNAs. These mitochondrial effects may be part of the progesterone recovery of neurosteroidogenesis. The enzymes 3ß-HSD, 3α-HSOR and 5α-reductase are also responsible for the formation of androgens. Because MS patients and EAE rodents show changes of central androgen levels, it is likely that, together with progestins and oestrogens, neuroandrogens afford neuroprotection for EAE and MS. The data reviewed suggest that enhanced synthesis of neurosteroids contributes in an auto/paracrine manner to reinforce the neuroprotective and anti-inflammatory effects of exogenous progesterone given to EAE mice.
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Encefalomielite Autoimune Experimental/tratamento farmacológico , Inflamação/tratamento farmacológico , Fármacos Neuroprotetores/uso terapêutico , Neurotransmissores/biossíntese , Progesterona/uso terapêutico , Animais , Encefalomielite Autoimune Experimental/metabolismo , Inflamação/metabolismo , Mitocôndrias/metabolismo , Fármacos Neuroprotetores/farmacologia , Progesterona/farmacologiaRESUMO
RESUMEN El quitosano (QT) es un biopolímero que ha sido ampliamente utilizado en aplicaciones de ingeniería de tejido óseo, demostrando un gran potencial para este propósito. El presente estudio tiene como objetivo desarrollar un sistema de hidrogel entrecruzable in situ, compuesto de quitosano y nano-partículas de hidroxiapatita (HAP), un equivalente al componente mineral del hueso. El quitosano fue modificado, utilizando reacciones de carbodiimida, con ácido lactobiónico y ácido azidobenzoico para hacerlo soluble a pH fisiológico y foto-entrecruzable, respectivamente. El quitosano modificado fue mezclado en diferentes proporciones con HAP, y luego de una corta exposición a luz UV, se formaron hidrogeles. Células madre mesenquimales de médula ósea de rata (MSC) fueron sembradas sobre estos hidrogeles y cultivadas por 4, 10 y 16 días, bajo condiciones osteogénicas y no-osteogénicas. A través de ensayos de proliferación celular, actividad de fosfatasa alcalina, y microscopía confocal, se observó que la mayoría de las formulaciones soportan la adhesión y proliferación celular, mostrando importantes interacciones célula-biomaterial, y una diferenciación osteogénica temprana destacada en las formulaciones 70:30 y 50:50, QT:HAP. Algunas formulaciones del sistema foto-entrecruzable tienen potencial en aplicaciones de ingeniería de tejido óseo, y se propone estudios más detallados de diferenciación celular.
ABSTRACT Chitosan (QT) is a biopolymer that has been used in widely used in bone tissue engineering applications, demonstrating great potential for that purpose. Therefore, the present study aims to develop an in situ crosslinking hydrogel system, composed of chitosan and hydroxyapatite (HAP). Briefly, chitosan was modified, using carbodiimide chemistry, with lactobionic and azidobenzoic acid to make it soluble at physiological pH and photo-crosslinkable, respectively. The modified chitosan was mixed with HAP, in different proportions, and later exposed to UV light, yielding hydrogels. Mesenchymal stem cells, from rat bone marrow, were seeded onto the hydrogels and cultured for 4, 10 and 16 days, under osteogenic and non-osteogenic conditions. Through cell proliferation and alkaline phosphatase activity assays, and confocal microscopy, it was observed that the majority of formulations supported cell adhesion and proliferation, and a significant early osteogenic differentiation in formulations 70:30 and 50:50, QT:HAP. According to these results, the proposed photo-crosslinking system has potential for tissue engineering applications, and further specific studies are proposed for cell differentiation.
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Damage observed in the hippocampus of the adult spontaneously hypertensive rat (SHR) resembles the neuropathology of mineralocorticoid-induced hypertension, supporting a similar endocrine dysfunction in both entities. In the present study, we tested the hypothesis that increased expression of the hippocampal mineralocorticoid receptor (MR) in SHR animals is associated with a prevalent expression of pro-inflammatory over anti-inflammatory factors. Accordingly, in the hippocampus, we measured mRNA expression and immunoreactivity of the MR and glucocorticoid receptor (GR) using a quantitative polymerase chain reaction and histochemistry. We also measured serum-glucocorticoid-activated kinase 1 (Sgk1 mRNA), the number and phenotype of Iba1+ microglia, as well as mRNA expression levels of the pro-inflammatory factors cyclo-oxygenase 2 (Cox2), Nlrp3 inflammasome and tumour necrosis factor α (Tnfα). Expression of anti-inflammatory transforming growth factor (Tgf)ß mRNA and the NADPH-diaphorase activity of nitric oxide synthase (NOS) were also determined. The results showed that, in the hippocampus of SHR rats, expression of MR and the number of immunoreactive MR/GR co-expressing cells were increased compared to Wistar-Kyoto control animals. Expression of Sgk1, Cox2, Nlrp3 and the number of ramified glia cells positive for Iba1+ were also increased, whereas Tgfß mRNA expression and the NADPH-diaphorase activity of NOS were decreased. We propose that, in the SHR hippocampus, increased MR expression causes a bias towards a pro-inflammatory phenotype characteristic for hypertensive encephalopathy.
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Hipocampo/metabolismo , Inflamação/metabolismo , Neurônios/metabolismo , Receptores de Mineralocorticoides/metabolismo , Animais , Ciclo-Oxigenase 2/genética , Ciclo-Oxigenase 2/metabolismo , Proteínas Imediatamente Precoces/genética , Proteínas Imediatamente Precoces/metabolismo , Masculino , Microglia/metabolismo , Óxido Nítrico Sintase/genética , Óxido Nítrico Sintase/metabolismo , Proteínas Serina-Treonina Quinases/genética , Proteínas Serina-Treonina Quinases/metabolismo , Ratos , Ratos Endogâmicos SHR , Ratos Endogâmicos WKY , Receptores de Glucocorticoides/genética , Receptores de Glucocorticoides/metabolismo , Receptores de Mineralocorticoides/genética , Fator de Crescimento Transformador beta/genética , Fator de Crescimento Transformador beta/metabolismoRESUMO
Mexican-heritage youth living along the U.S.-Mexico border have higher rates of obesity than non-Hispanic Whites. Parenting strategies may influence youth physical activity (PA) and sedentary behaviors (SB) mitigating these obesity rates; however, parenting strategies have not been well examined in Hispanic cultures. Therefore, we examined relationships between parenting strategies and PA and SB of Mexican-heritage youth. Mother-child dyads (n = 121 dyads) were surveyed during the summer and school-year. Quantile regression estimated relationships between parenting strategies, and PA and SB. Summer. Reinforcement was negatively associated with moderate-to-vigorous PA (MVPA) among more active youth (ß = -364.4); limit setting was negatively associated with SB among less sedentary youth (ß = -23.3); and use of discipline was negatively associated with sedentary screen time in youth reporting less screen use (ß = -3.2). School-year. Males reported more MVPA (773.9 min/week) than females (738.7 min/week). Reinforcement was positively associated with weekly MVPA among more active youth (ß = 173.6), fewer sedentary minutes/week among all youth, and fewer sedentary screen time minutes among less sedentary youth (ß = -6.4). Parenting strategies are related with PA and SB. Investigators should focus on identifying modifiable parenting strategies to address the various needs presented during summertime and school-year for Mexican-heritage youth.
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Exercício Físico , Hispânico ou Latino/estatística & dados numéricos , Poder Familiar , Adolescente , Criança , Feminino , Humanos , Masculino , Comportamento Sedentário , Populações VulneráveisRESUMO
Wobbler mutant mice suffer from progressive motoneuron degeneration and glial cell reactivity in the spinal cord. To prevent development of these abnormalities, we employed Nestorone, a high-affinity progesterone receptor agonist endowed with neuroprotective, promyelinating and anti-inflammatory activities in experimental brain ischemia, preventing neuroinflammation and chemical degeneration. Five-month-old Wobbler mice (wr-/wr-) received s.c. injections of 200µg/day/mouse of Nestorone in vegetable oil or vehicle for 10days. Control NFR/NFR mice (background strain for Wobbler) received vehicle only. Vehicle-treated Wobblers showed typical spinal cord abnormalities, such as vacuolated motoneurons, decreased immunoreactive choline-acetyltransferase, decreased expression of glutamine synthase (GS), increased glial fibrillary acidic protein-positive (GFAP) astrogliosis and curved digits in forelimbs. These cell-specific abnormalities were normalized in Nestorone-treated Wobblers. In addition, vehicle-treated Wobblers showed Iba1+ microgliosis, high expression of the microglial marker CD11b mRNA and up-regulation of the proinflammatory markers TNFα and iNOS mRNAs. In Nestorone-treated Wobblers, Iba1+ microgliosis subsided, whereas CD11b, TNFα and iNOS mRNAs were down-regulated. NFκB mRNA was increased in Wobbler spinal cord and decreased by Nestorone, whereas expression of its inhibitor IκBα was increased in Nestorone-treated Wobblers compared to control mice and vehicle-treated Wobblers. In conclusion, our results showed that Nestorone restraining effects on proinflammatory mediators, microgliosis and astrogliosis may support neurons in their resistance against degenerative processes.
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Anti-Inflamatórios/farmacologia , Doença dos Neurônios Motores/tratamento farmacológico , Fármacos Neuroprotetores/farmacologia , Norprogesteronas/farmacologia , Receptores de Progesterona/agonistas , Medula Espinal/efeitos dos fármacos , Animais , Astrócitos/efeitos dos fármacos , Astrócitos/metabolismo , Astrócitos/patologia , Modelos Animais de Doenças , Gliose/tratamento farmacológico , Gliose/patologia , Gliose/fisiopatologia , Masculino , Camundongos Mutantes , Microglia/efeitos dos fármacos , Microglia/metabolismo , Microglia/patologia , Doença dos Neurônios Motores/patologia , Doença dos Neurônios Motores/fisiopatologia , Neurônios Motores/efeitos dos fármacos , Neurônios Motores/metabolismo , Neurônios Motores/patologia , Neuroimunomodulação/efeitos dos fármacos , Neuroimunomodulação/fisiologia , Receptores de Progesterona/metabolismo , Medula Espinal/metabolismo , Medula Espinal/patologia , Resultado do TratamentoRESUMO
Este artigo busca analisar, pela primeira vez, a trajetória empregatícia de profissionais recém-formados em cursos de engenharias, medicina e licenciaturas. Para isso, serão combinadas as informações dos concluintes desses cursos superiores, inscritos nas edições de 2010 e 2011 do Exame Nacional de Desempenho de Estudantes (Enade), o conceito Enade obtido pelas instituições de ensino desses inscritos e as informações dos vínculos empregatícios dos profissionais, no ano subsequente à graduação destes, declarados na Relação Anual de Informações Sociais (Rais) de 2011 e 2012.
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Mercado de Trabalho , Médicos , Setor de Assistência à SaúdeRESUMO
BACKGROUND: Colonias are substandard residential areas along the U.S.-Mexico border. Families of Mexican-origin living in colonias face health burdens characterized by environmental and socioeconomic hardships. Mexican Americans and low-income families, including colonias children, do not frequently participate in physical activity despite the known link to disease risk reduction. For colonias children, schools are the most commonly reported location for physical activity. School closures and extreme temperatures during summer months create a need to explore seasonal differences in environmental supports and barriers in this population. The purpose of this study was to examine the effect of seasonality on perceived environmental barriers, opportunities, and social support for physical activity among colonias children. As a secondary aim, mother-child discordance for each factor was analyzed. METHODS: Promotora-researchers recruited mother-child dyads (n=101 dyads, n=202 participants) from colonias in Hidalgo County, Texas. Mothers and children were separately administered surveys at two time points to capture perceived barriers, opportunities, and social support for physical activity (school-year: February-May; summertime: July-August). Summative scores for each outcome were calculated and three multilevel longitudinal models for continuous outcomes were examined; children were nested within households. Mother-child discordance was measured using Cohen's Kappa statistic. RESULTS: Physical activity barriers and environmental opportunities (household and neighborhood) increased from school-year to summer by 1.16 and 2.83 points respectively (p≤0.01), after adjusting for covariates. Significant predictors of increased barriers included household income of >$900/month and having more household members. Children of mothers with significant others who were employed part-time or full-time saw significant decreases in barriers. Mother-child agreement of barriers, environmental opportunities, and social support across seasons was slight to fair (range: median κ=0.047 to κ=0.262). CONCLUSIONS: These results suggest a complex relationship between dimensions of economic hardship (employment status, household income, etc ) and perceived opportunities and barriers of children's physical activity engagement during the school-year and summer. In this study, both barriers and opportunities increased from school-year to summer, further demonstrating that interactions among these characteristics need to be better understood and addressed when considering physical activity initiatives for colonias and other Mexican-American children, specifically during summer when school-based physical activity resources are unavailable.
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Meio Ambiente , Exercício Físico , Americanos Mexicanos , Pobreza , Instituições Acadêmicas , Estações do Ano , Apoio Social , Adulto , Criança , Características da Família , Feminino , Humanos , Masculino , Mães , Atividade Motora , Percepção , Características de Residência , Fatores Socioeconômicos , TexasRESUMO
Discrimination of particular species within the species complexes of tephritid fruit flies is a very challenging task. In this fruit-fly family, several complexes of cryptic species have been reported, including the African cryptic species complex (FAR complex). Cuticular hydrocarbons (CHCs) appear to be an excellent tool for chemotaxonomical discrimination of these cryptic species. In the present study, CHC profiles have been used to discriminate among three important agricultural pests from the FAR complex, Ceratitis fasciventris, Ceratitis anonae and Ceratitis rosa. Hexane body surface extracts of mature males and females were analyzed by two-dimensional gas chromatography with mass spectrometric detection and differences in CHC profiles between species and sexes tested through multivariate statistics and compared with species identification by means of microsatellite markers. Quantitative as well as qualitative CHC profile differences between sexes and species are reported. The CHC profiles consisted of a mixture of linear, internally methyl-branched and mono-, di- and tri-unsaturated alkanes. Twelve compounds were pinpointed as potential chemotaxonomical markers. The present study shows that presence or absence of particular CHCs might be used in the chemical diagnosis of the FAR complex. Moreover, our results represent an important first step in the development of a useful chemotaxonomic tool for cryptic species identification of these important agricultural pests.
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Hidrocarbonetos/química , Tephritidae/classificação , Animais , Classificação/métodos , Feminino , Genótipo , Proteínas de Insetos/química , Masculino , Repetições de Microssatélites , Polimorfismo Genético , Caracteres Sexuais , Especificidade da Espécie , Tephritidae/químicaRESUMO
Although changes of circulating steroids have been reported in patients with sporadic amyotrophic lateral sclerosis (ALS), a full comparison of the adrenal and gonadal steroid profile between control subjects and ALS patients is lacking. Considering that respiratory failure is the most frequent cause of death in ALS, we looked into whether a relationship emerged between circulating steroids and respiratory parameters. Serum levels of adrenal and gonadal steroids were measured in 52 age- and gender-matched subjects (28 ALS and 24 controls) using radioimmunoassay techniques. We also evaluated respiratory parameters in ALS patients, including forced vital capacity (FVC), maximal inspiratory pressure (MIP), and maximal expiratory pressure (MEP). We found increased levels of testosterone in female ALS patients compared to healthy female subjects. Furthermore, control subjects showed a significant decline of testosterone, dehydroepiandrosterone and its sulfate, and a borderline decline of progesterone with increasing age. Instead, testosterone did not decline with increasing age in ALS patients. We also found that the dehydroepiandrosterone sulfate/cortisol ratio was positively associated with FVC, MIP, and MEP. Moreover, ALS patients showing higher testosterone levels and lower progesterone/free testosterone ratio presented a more rapid worsening of the monthly FVC. In conclusion, first our study revealed a differential steroid profile with age and gender in ALS patients relative to controls. Second, we demonstrated an association between some steroids and their ratios with respiratory function and disease progression. Thus, we hypothesize that the endogenous steroid profile could be a marker of susceptibility and prognosis in ALS patients.
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Glândulas Suprarrenais/metabolismo , Esclerose Lateral Amiotrófica/sangue , Gônadas/metabolismo , Esteroides/sangue , Fatores Etários , Esclerose Lateral Amiotrófica/fisiopatologia , Biomarcadores/sangue , Estudos de Casos e Controles , Progressão da Doença , Suscetibilidade a Doenças , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Respiração , Resultado do Tratamento , Capacidade VitalRESUMO
Este estudo apresenta um método de projeção populacional capaz de estimar, para o Brasil, a oferta de mão de obra qualificada com nível superior de escolaridade em áreas específicas do conhecimento. Para tanto, emprega-se uma metodologia que utiliza um conjunto de bases de dados públicos (SIM/Datasus, Censo Demográfico, Censo da Educação Superior e PNADs). Ao combinar a equação compensadora com um modelo simplificado das entradas e saídas no mercado de trabalho, a metodologia proposta permite calcular a projeção ano a ano com resultados desagregados por sexo e grupos quinquenais de idade. O estudo apresenta também os resultados da aplicação dessa metodologia na simulação de cenários sobre a disponibilidade de profissionais com formação em cursos de engenharia, produção e construção, no mercado de trabalho brasileiro até 2020. Os cenários se diferenciam em função dos possíveis ritmos de expansão a serem observados no número de ingressantes e concluintes em cursos de ensino superior nessas áreas. Caso as tendências recentes se concretizarem, o mercado de trabalho brasileiro poderá contar, em 2020, com um estoque entre 1,9 e 2,3 milhões de pessoas formadas em engenharias por instituições brasileiras de ensino superior. Os resultados apontam ainda que serão observadas duas alterações relevantes: a feminização e o rejuvenescimento da força de trabalho com diploma nas áreas de engenharia.
This paper presents a method to project degree-holding workforces in specific areas of knowledge in Brazil. The method uses a set of bases of public data (SIM/Datasus, Demographic Censuses, Higher Education Censuses, and Household Surveys). By combining a compensating equation with a simplified model of entries into and departures from the labor market, the methodology enables year-by-year projections with unbundled by sex and by five-year age groups. The study also shows the results of applying this methodology to the simulation of scenarios on the availability of professionals with college degrees in engineering, production and construction, for the Brazilian labor market until 2020. The scenarios are different in function of possible periods of growth to be seen in the number of persons entering and concluding college-level courses in these areas. If recent trends solidify, the Brazilian workforce may have between 1.6 and 2.3 million persons who have earned degrees in engineering in Brazil in 2020. The results also indicate two major changes in this area in coming years: feminization and rejuvenation.
Este estudio presenta un método de proyección poblacional capaz de estimar, para Brasil, la oferta de mano de obra calificada con nivel superior de escolaridad en áreas específicas del conocimiento. Para ello se emplea una metodología que utiliza un conjunto de bases de datos públicos (SIM/Datasus, Censo Demográfico, Censo de la Educación Superior y PNADs). Combinando la ecuación compensadora con un modelo simplificado de los ingresos y egresos en el mercado de trabajo, la metodología propuesta permite calcular la proyección año tras año con resultados desagregados por sexo y grupos quinquenales de edad. El estudio presenta asimismo los resultados de la aplicación de esta metodología en la simulación de escenarios sobre la disponibilidad de profesionales con formación en cursos de ingeniería, producción y construcción, en el mercado laboral brasileño hasta el 2020. Los escenarios se diferencian en función de los posibles ritmos de expansión a observar en el número de ingresantes y egresados en cursos de educación superior en dichas áreas. Si las recientes tendencias se concretan, el mercado laboral brasileño podrá contar, en 2020, con un stock que varía entre 1,9 y 2,3 millones de personas graduadas en ingenierías por instituciones brasileñas de nivel superior. Los resultados también señalan que se observarán dos cambios importantes: la feminización y el rejuvenecimiento de la fuerza de trabajo con diploma en el área de ingeniería.
Assuntos
Humanos , Masculino , Feminino , Adulto , Pessoa de Meia-Idade , Engenharia , Mercado de Trabalho , Previsões Demográficas , Brasil , EmpregoRESUMO
Progesterone is a neuroprotective, promyelinating and anti-inflammatory factor for the nervous system. Here, we review the effects of progesterone in models of motoneurone degeneration and neuroinflammation. In neurodegeneration of the Wobbler mouse, a subset of spinal cord motoneurones showed increased activity of nitric oxide synthase (NOS), increased intramitochondrial NOS, decreased activity of respiratory chain complexes, and decreased activity and protein expression of Mn-superoxide dismutase type 2 (MnSOD2). Clinically, Wobblers suffered several degrees of motor impairment. Progesterone treatment restored the expression of neuronal markers, decreased the activity of NOS and enhanced complex I respiratory activity and MnSOD2. Long-term treatment with progesterone increased muscle strength, biceps weight and survival. Collectively, these data suggest that progesterone prevented neurodegeneration. To study the effects of progesterone in neuroinflammation, we employed mice with experimental autoimmune encephalomyelitis (EAE). EAE mice spinal cord showed increased mRNA levels of the inflammatory mediators tumour necrosis factor (TNF)α and its receptor TNFR1, the microglial marker CD11b, inducible NOS and the toll-like receptor 4. Progesterone pretreatment of EAE mice blocked the proinflammatory mediators, decreased Iba1+ microglial cells and attenuated clinical signs of EAE. Therefore, reactive glial cells became targets of progesterone anti-inflammatory effects. These results represent a starting point for testing the usefulness of neuroactive steroids in neurological disorders.
Assuntos
Modelos Animais de Doenças , Encefalomielite Autoimune Experimental/tratamento farmacológico , Doenças Neurodegenerativas/tratamento farmacológico , Fármacos Neuroprotetores/farmacologia , Progesterona/farmacologia , Progestinas/farmacologia , Animais , CamundongosRESUMO
BACKGROUND: The increasing numbers of colonias along the U.S.-Mexico border are characterized by disproportionately poor families of Mexican-origin, limited access to resources and health services, and heightened risk for obesity and diabetes. Despite consistent evidence supporting physical activity (PA) in prevention of chronic diseases, many individuals of Mexican-origin, including children, fail to meet PA recommendations. Environmental influences on PA, founded in ecological and social cognitive perspectives, have not been examined among children living in colonias. The purpose of this study was to identify and better understand (1) household and neighborhood environmental PA resources/supports, (2) perceived barriers to engaging in PA, and (3) PA offerings, locations, and transportation characteristics for Mexican-origin children living in colonias. METHODS: Data for this study were collected by promotora-researchers (indigenous community health workers trained in research methods) using face-to-face interviews conducted in Spanish. The sample consists of 94 mother-child dyads from Texas border colonias in Hidalgo County. Interviews included questionnaire items addressing PA barriers, household and neighborhood environmental support assessments conducted with each dyad, and open-ended questions that were coded to identify availability and locations of PA opportunities and transportation options. Descriptive statistics were calculated and differences between genders, birth countries, and BMI categories of children were determined using chi-square tests. RESULTS: All children were of Mexican-origin. The most frequently reported barriers were unleashed dogs in the street, heat, bad weather, traffic, no streetlights, and no place like a park to exercise. Prominent locations for current PA included schools, home, and parks. Common PA options for children were exercise equipment, running, playing, and sports. Environmental assessments identified exercise equipment (bicycles/tricycles, balls, etc. ), paved/good streets, yard/patio space, and social norms as the most frequent household or neighborhood resources within these colonias. Differences in PA barriers, options, and environmental resources for genders, birth countries, and BMI categories were detected. CONCLUSIONS: This study suggests that PA environmental resources, barriers, and opportunities for colonias children are similar to previous studies and distinctively unique. As expected, built resources in these communities are limited and barriers exist; however, knowledge of PA opportunities and available PA resources within colonias households and neighborhoods offers insight to help guide future research, policy, and PA initiatives.
Assuntos
Planejamento Ambiental/estatística & dados numéricos , Americanos Mexicanos/psicologia , Atividade Motora , Características de Residência/estatística & dados numéricos , Índice de Massa Corporal , Criança , Características da Família/etnologia , Feminino , Humanos , Masculino , Americanos Mexicanos/estatística & dados numéricos , Pesquisa Qualitativa , Fatores Sexuais , Fatores Socioeconômicos , TexasRESUMO
It is now recognised that progesterone plays a protective role for diseases of the central nervous system. In the Wobbler mouse, a model of motoneurone degeneration, progesterone treatment prevents spinal cord neuropathology and clinical progression of the disease. However, neuropathological and functional abnormalities have also been discovered in the brain of Wobbler mice and patients with amyotrophic lateral sclerosis. The present study examined the hippocampus of control and afflicted Wobbler mice and the changes in response to progesterone treatment. Mice received either a single progesterone implant (20 mg for 18 days). We found that the hippocampal pathology of the untreated Wobblers involved a decreased expression of brain-derived neurotrophic factor (BDNF) mRNA, decreased astrogliosis in the stratum lucidum, stratum radiatum and stratum lacunosum-moleculare, decreased doublecortin (DCX)-positive neuroblasts in the subgranular zone of the dentate gyrus and a decreased density of GABA immunoreactive hippocampal interneurones and granule cells of the dentate gyrus. Although progesterone did not change the normal parameters of control mice, it attenuated several hippocampal abnormalities in Wobblers. Thus, progesterone increased hippocampal BDNF mRNA expression, decreased glial fibrillary acidic protein-positive astrocytes and increased the number of GABAergic interneurones and granule cells. The number of DCX expressing neuroblasts and immature neurones remained impaired in both progesterone-treated and untreated Wobblers. In conclusion, progesterone treatment exerted beneficial effects on some aspects of hippocampal neuropathology, suggesting its neuroprotective role in the brain, in agreement with previous data obtained in the spinal cord of Wobbler mice.